docs: def search_tweets_iterable(self, order, callback=None):
          """ Returns itself and queries the Twitter API. Is called when using \
          an instance of this class as iterable. \
          See `Basic usage <basic_usage.html>`_ for examples
  
          :param order: An instance of TwitterOrder class \
          (e.g. TwitterSearchOrder or TwitterUserOrder)
          :param callback: Function to be called after a new page \
          is queried from the Twitter API
          :returns: Itself using ``self`` keyword
          """
  
          if callback:
              if not callable(callback):
                  raise TwitterSearchException(1018)
              self.__callback = callback
  
          self.search_tweets(order)
          return self